6*5 as single factorial code example

Example 1: calculate factorial

int factorial(int n) {
	int res = 1, i; 
    for (i = 2; i <= n; i++) 
        res *= i; 
    return res; 
}

Example 2: factorial of 8

function getFactorial($int)
{
   
    $factorial = 1;
    for ($i = $int; $i > 1; $i--)
    {
        $factorial *= $i;
    }
    echo "The factorial of " . $int . " is " . $factorial . '<br>';
}